The store is for you! If you are not satisfied with the product, please contact me first and do not leave negative feedback lightly. Thank you, have a nice day Quality shops are at your service! Powerful effect Multiple blades are chamfered, with easy to drain dirt and hard to dull holes. When the automatic center punch presses the surface, it emits a spring-loaded automatic punch. The adjustable cover can adjust the impact force. [Sturdy and Durable] HSS counterbore has the highest strength and durability. Provides excellent cutting ability. High hardness and wear resistance, easy and fast drilling. [Widely Used] It can be used to embed countersunk screws and fasteners in wood and soft metal. Ideal for wood, fiberboard, particle board, plywood, plastic, aluminum and circuit boards. High quality Can withstand strong impact, wear resistance, and extend the life of the punch. [Various sizes] 12mm (1/2 inch), 16mm (5/8 inch), 19mm (3/4 inch). Material: high carbon steel Chamfer angle: 90